We did online check-in for OKW last weekend. We wanted a higher room than ground which we had requested when we made our reservation. We were assigned a ground room. Also, because our kids are over age 10, their keys had charging privileges on them, so when we arrived (there was no line, the online check-in area was clearly marked and a CM was standing by ready to get our folder), we needed to get new keys for them (non-charging). Since we were having to get new keys anyway, I asked if an upper floor room was available - there was, in a different building, but they easily moved us - and it was to the Millers Rd area which is the only area in OKW we had not yet stayed (building 18 - loved it!).
Anyway, if they were to ask what "requests" I would like to be able to make online, I would like a "higher floor" option as well as the ground floor; also an opportunity to mark "no charging privileges" for specific guests. We also had to request and wait for a parking permit -- it would've been nice to have been able to check a box that said we would need one.
But even so, it was a bit faster than regular check-in because we didn't have to produce ID / credit card, etc. Just picked up our packet, made those few changes, and off we went.